Java review并发编程的相关内容

Java Review - 并发编程_ThreadPoolExecutor原理&源码剖析

线程池主要解决两个问题一是当执行大量异步任务时线程池能够提供较好的性能。在不使用线程池时，每当需要执行异步任务时直接new一个线程来运行，而线程的创建和销毁是需要开销的。线程池里面的线程是可复用的，不需要每次执行异步任务时都重新创建和销毁线程。二是线程池提供了一种资源限制和管理的手段，比如可以限制线...

Java Review - 并发编程_ConcurrentLinkedQueue原理&源码剖析

概述JDK中提供了一系列场景的并发安全队列。总的来说，按照实现方式的不同可分为阻塞队列和非阻塞队列，阻塞队列使用锁实现非阻塞队列则使用CAS非阻塞算法实现ConcurrentLinkedQueueConcurrentLinkedQueue是线程安全的无界非阻塞队列，其底层数据结构使用单向链表实现，对...

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Java Review - 并发编程_抽象同步队列AQS

概述 AQS——锁的底层支持AbstractQueuedSynchronizer抽象同步队列简称AQS，它是实现同步器的基础组件，并发包中锁的底层就是使用AQS实现的。另外，我们基本上直接使用AQS框架开发的机会很少，但是知道其原理对于架构设计还是很有帮助的。AQS是一个FIFO的双向队列，其内部通...

Java Review - 并发编程_独占锁ReentrantLock原理&源码剖析

Synchronized vs ReentrantLockReentrantLock概述ReentrantLock是可重入的独占锁，同时只能有一个线程可以获取该锁，其他获取该锁的线程会被阻塞而被放入该锁的AQS阻塞队列里面。类图结构如下底层基于AQS实现，ReentrantLock的lock等方法，...

Java Review - 并发编程_前置知识二

What’s 多线程并发编程首先要澄清并发和并行的概念并发是指同一个时间段内多个任务同时都在执行，并且都没有执行结束并行是说在单位时间内多个任务同时在执行并发任务强调在一个时间段内同时执行，而一个时间段由多个单位时间累积而成，所以说并发的多个任务在单位时间内不一定同时在执行。在单CPU的时代多个任务...

Java Review - 并发编程_ 信号量Semaphore原理&源码剖析

概述Semaphore信号量也是Java中的一个同步器，与CountDownLatch和CycleBarrier不同的是，它内部的计数器是递增的，并且在一开始初始化Semaphore时可以指定一个初始值，但是并不需要知道需要同步的线程个数，而是在需要同步的地方调用acquire方法时指定需要同步的线...

Java Review - 并发编程_ 回环屏障CyclicBarrier原理&源码剖析

PreJava Review - 并发编程_ CountDownLatch原理&源码剖析介绍的CountDownLatch在解决多个线程同步方面相对于调用线程的join方法已经有了不少优化，但是CountDownLatch的计数器是一次性的，也就是等到计数器值变为0后，再调用CountDow...

Java Review - 并发编程_ CountDownLatch原理&源码剖析

Pre每日一博 - CountDownLatch使用场景分析以及源码分析在日常开发中经常会遇到需要在主线程中开启多个线程去并行执行任务，并且主线程需要等待所有子线程执行完毕后再进行汇总的场景。在CountDownLatch出现之前一般都使用线程的join()方法来实现这一点，但是join方法不够灵活...

Java Review - 并发编程_ScheduledThreadPoolExecutor原理&源码剖析

概述Java Review - 并发编程_ThreadPoolExecutor原理&源码剖析我们复习了Java中线程池ThreadPoolExecutor的原理，ThreadPoolExecutor只是Executors工具类的一部分功能。下面来介绍另外一部分功能，也就是Scheduled...

Java Review - 并发编程_ThreadPoolExecutor原理&源码剖析（下）

首先来分析第一部分的代码6 // 6 检查队列是否只在必要的时候为空 if (rs >= SHUTDOWN && ! (rs == SHUTDOWN && firstTask == null && ...

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